An mmmPIZZA Geocache.

Celebrating 1,000 Geocache Finds!
In March 2016, I reached the huge milestone of 1,000 finds. For me, this was huge anyway. So I thought I'd give back to the geocaching community with this puzzle cache. My first hide of this type. Here's to the next 1,000 finds. Maybe another mystery at 2,000? Happy caching!
The Backstory.
This is the story about Granddad. Now Granddad was a member of the British Royal Navy during the 1930's. He passed away in 1983, only aged 67. On his death bed, he gave Nan a piece of cross-stitching. He said that it was the location to his long lost treasure. He died shortly after giving this information. In 1985, Nan found the treasure and in 2005, she placed a geocache in the treasure’s former location. Seven years later, Nan gave the pieces of damaged cross-stitching to me and told me to publish them to the world ‘when the time was right’. Now that I’ve hit 1,000 finds, I felt like the time was right to release the pieces of cross-stitching to the world. They decode the coordinates that lead to the geocache location. I hope that you can figure out the coordinates and continue the legacy of Alexander’s Treasure.
WARNING: Stealth is seriously required as this cache is in the town centre. The muggle levels will be high during the day. I recommend a late evening after the shops are shut, although do be aware of drunk muggles who wish to party in the town's 'hottest' clubs.